CN103469121A - Device and method for preparing aluminium oxide short staple preform - Google Patents
Device and method for preparing aluminium oxide short staple preform Download PDFInfo
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- CN103469121A CN103469121A CN2013103767896A CN201310376789A CN103469121A CN 103469121 A CN103469121 A CN 103469121A CN 2013103767896 A CN2013103767896 A CN 2013103767896A CN 201310376789 A CN201310376789 A CN 201310376789A CN 103469121 A CN103469121 A CN 103469121A
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Abstract
The invention discloses a device and a method for preparing an aluminium oxide short staple preform to solve the technical problem of long preparation cycle of an existing method for preparing the aluminium oxide short staple preform. According to the technical scheme, a pressure cover (3) is provided with a pressure cover pore (2) and a porous mold is connected with an air breather through a quick connector. A bottom cover (9) is in a dual-layer structure, a plurality of micropores are distributed uniformly on the upper layer, a bottom cover pore (10) is arranged on the lower layer, and the bottom cover pore (10) is connected with a vacuum pump through the quick connector. A plurality of pressure head micropores (8) are distributed on a pressure head (7). An extrusion tank (5) is in thread connection with the pressure cover (3) and the bottom cover (9), the upper end of a vertical pressure lever (4) is fixedly connected with a horizontal pressure lever (1), and the lower end of the vertical pressure lever (4) passes through the pressure cover (3) and is then connected with the pressure head (7) through a bearing. Excess additive and water are removed through a vacuum pumping mode, so that cracking of the preform is effectively prevented, the process of preparing the preform quickly is implemented, and the preparation cycle is shortened.
Description
Technical field
The present invention relates to a kind of device for preparing aluminium sesquioxide staple fibre precast body.Also relate to the method that the device that utilizes this device to prepare aluminium sesquioxide staple fibre precast body prepares aluminium sesquioxide staple fibre precast body.
Background technology
Metal-base composites, because having than high specific strength, specific rigidity, specific modulus and good capability of electromagnetic shielding and high thermal resistance, absorbing and designability preferably, has increasing application potential in fields such as aerospace, weaponry and automotive electronics.While adopting the vacuum pressure method of impregnation to prepare short fiber reinforced metal-base composite materials, require the liquid matrix alloy to infiltrate in the precast body matrix porosity under 0.1～1MPa pressure, so require precast body should there is certain hot strength.In addition, Fiber Aspect Ratio, volume fraction and the factors such as distributing homogeneity and preparation technology all can affect the performance of precast body.Therefore, preparing the high-performance prefabricated body is to obtain the basis of high performance composite with crucial.
The preparation of staple fibre precast body mainly faces following problem: the one, and reunite in the part of staple fibre; The 2nd, the volume fraction caused due to the resilience problem when prepared by the precast body wet method is unstable; The 3rd, the precast body preparation cycle is oversize, be difficult to realize the problems such as mass production.
Document " patent publication No. is the Chinese invention patent of CN101575687A " discloses a kind of Al
2o
3the preparation method of short fiber reinforced composite prefabricated part ", the method successfully makes the controlled precast body of overall size.Its processing step is by treated Al
2o
3fiber with pour mould into after silicon sol is mixed in proportion into uniform fiber oar material, the matched moulds pressurization, obtain the precast body profiled member after drying.This technique can make Al
2o
3fiber dispersion is even, but has following problem: the one, and the precast body dwell time is too short is only 15～20s, easily causes precast body to take out the defects such as rear cracking, layering; The 2nd, precast body is dried binding agent segregation, precast body delamination splitting or the inhomogeneous inhomogeneous problem of intensity distribution that causes of drying course of easily occurring in 150～200 ℃ of baking ovens.The invert point that document shows silicon sol in addition is 800 ℃ of left and right, so at this temperature, silicon sol changes not exclusively, does not have due bond effect, and binding agent transforms and not exclusively remains in precast body, and the over-all properties of matrix material is had a negative impact.The most important thing is in infiltration process, silicon sol generates the amount of fragility MgO crystal and Si-Mg phase as the generation side reactions such as Al, Mg in binding agent and alloy and can the over-all properties of matrix material be had a negative impact when abundant; The 3rd, Al
2o
3fiber and precast body reach 30～40h time of drying, the precast body manufacturing cycle is long, simultaneously long precast body cracking, the even fibre shedding phenomenon of easily causing of roasting time, also can cause binding agent to precast body surrounding segregation, makes the precast body center intensity after sintering on the low side.
Summary of the invention
In order to overcome the existing long deficiency of aluminium sesquioxide staple fibre precast body method preparation cycle for preparing, the invention provides a kind of device for preparing aluminium sesquioxide staple fibre precast body.The gland of this device is provided with the gland pore, by rapid-acting coupling, realizes being connected of porous mold and breather.Described bottom is bilayer structure, and upper strata is uniformly distributed some micropores, and lower floor is provided with the bottom pore, by rapid-acting coupling, with vacuum pump, is connected.Be distributed with some pressure head micropores on described pressure head.Described container is threaded with gland, bottom, and perpendicular depression bar upper end and horizontal depression bar are connected, and perpendicular depression bar lower end screw thread is connected with pressure head by bearing through after gland.The present invention removes by vacuumizing mode the cracking that unnecessary additive and moisture method can effectively suppress precast body, realizes that precast body produces process fast, can improve preparation efficiency, shortens preparation cycle.
The present invention also provides and utilizes the above-mentioned device for preparing aluminium sesquioxide staple fibre precast body to prepare the method for aluminium sesquioxide staple fibre precast body.
The technical solution adopted for the present invention to solve the technical problems is: a kind of device for preparing aluminium sesquioxide staple fibre precast body is characterized in comprising horizontal depression bar 1, gland 3, perpendicular depression bar 4, container 5, bearing 6, pressure head 7 and bottom 9.Described gland 3 is provided with gland pore 2, and gland pore 2 is threaded holes, by rapid-acting coupling, realizes being connected of porous mold and breather.Described bottom 9 is bilayer structures, and upper strata is uniformly distributed some micropores, and lower floor is provided with bottom pore 10, and bottom pore 10 is threaded holes, by rapid-acting coupling, with vacuum pump, is connected.Be distributed with some pressure head micropores 8 on described pressure head 7.Described container 5 is threaded with gland 3, bottom 9, and perpendicular depression bar 4 upper ends and horizontal depression bar 1 are connected, and perpendicular depression bar 4 lower end screw threads are connected with pressure head 7 by bearing through after gland 3.
A kind ofly utilize the above-mentioned device for preparing aluminium sesquioxide staple fibre precast body to prepare the method for aluminium sesquioxide staple fibre precast body, be characterized in comprising the following steps:
Step 1, by continuous polymorph A l
2o
3fiber is cut into the discontinuous Al that length is 1～10mm
2o
3staple fibre, adopt mechanical stirring device by discontinuous Al
2o
3staple fibre is stirring at low speed 10～15min in room temperature water, uses the filtering screening device by fiber filter and pulls out, to remove slag ball wherein.
The invention has the beneficial effects as follows: the gland of this device is provided with the gland pore, by rapid-acting coupling, realizes being connected of porous mold and breather.Described bottom is bilayer structure, and upper strata is uniformly distributed some micropores, and lower floor is provided with the bottom pore, by rapid-acting coupling, with vacuum pump, is connected.Be distributed with some pressure head micropores on described pressure head.Described container is threaded with gland, bottom, and perpendicular depression bar upper end and horizontal depression bar are connected, and perpendicular depression bar lower end screw thread is connected with pressure head by bearing through after gland.The present invention removes by vacuumizing mode the cracking that unnecessary additive and moisture method can effectively suppress precast body, realizes that precast body produces process fast, has greatly improved preparation efficiency, has shortened preparation cycle.
Below in conjunction with drawings and Examples, the present invention is elaborated.
The accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram that the present invention prepares aluminium sesquioxide staple fibre precast body.
In figure, the horizontal depression bar of 1-, 2-gland pore, the 3-gland, 4-erects depression bar, 5-container, 6-bearing, 7-pressure head, 8-pressure head micropore, 9-bottom, 10-bottom pore.
Embodiment
Device embodiment.The device that the present invention prepares aluminium sesquioxide staple fibre precast body comprises horizontal depression bar 1, gland 3, perpendicular depression bar 4, container 5, bearing 6, pressure head 7 and bottom 9.Described perpendicular depression bar 4 is the stainless steel leading screw, by bearing 6, with pressure head 7, be connected, so avoided the overwear vt. of pressure head 7 with container 5, and the existence of this structure can avoid pressure head 7 to rotate because of the rotation of perpendicular depression bar 4, the power that assurance imposes on fibre stuff is straight down all the time, has avoided stressed inclination or inhomogeneous.Described gland 3 is provided with the gland pore 2 that a diameter is 10mm, and gland pore 2 is threaded holes, by rapid-acting coupling, realizes being connected of porous mold and breather, facilitates constant temperature gas smoothly by reaching the purpose of precast body drying.Described bottom 9 is bilayer structures, and upper strata is uniformly distributed the micropore that diameter is 2mm, realizes passing through smoothly of the unnecessary additive of porous preform pressing process and moisture, but will add the filtration gauze pad before compacting, in case fiber fines leaches with water from micropore; Lower floor arranges the bottom pore 10 that a diameter is 10mm, and bottom pore 10 is threaded holes, by rapid-acting coupling, with vacuum pump, is connected, and by vacuumizing mode, removes excessive moisture or additive.The pressure head micropore 8 that to be covered with diameter on described pressure head 7 be 2mm, can realize that the constant temperature gas uniform, smoothly by precast body, realizes removing unnecessary additive and moisture from bottom 9 by vacuumizing mode simultaneously.The use of described porous mold can be guaranteed the precast body uniform drying, has avoided porous preform to be prone to the problem of other deformation defects such as fibre shedding, crackle, layering in drying process.Described container 5 is threaded with gland 3, bottom 9, and perpendicular depression bar 4 upper ends and horizontal depression bar 1 are connected, and lower end is connected with pressure head 7 by bearing.So can guarantee the pressurize problem after cure under pressure, and facilitate the Assembly And Disassembly of experimental installation.
Embodiment of the method 1.
The discontinuous Al of step 1.
2o
3the pre-treatment of staple fibre and screening.
(1) want to make the Al that volume fraction is 5%
2o
3precast body, take quantitative Al according to calculating
2o
3macrofiber, and cut the manual discontinuous Al that cuts short growth degree 1mm
2o
3staple fibre, the method can effectively be eliminated discontinuous Al
2o
3the agglomerating phenomenon of the gathering of staple fibre.
(2) adopt mechanical stirring device first in the mode of crawl, to break up in advance the fiber of reunion, when slurries dispersion to be mixed is more even, then change stirring at low speed 10min into, remove and be suspended in the impurity on slurry upper strata and the slag ball in mixed slurry, make it to form turbulent flow to facilitate Al
2o
3the subsequent disposal of fiber.Utilize the filtering screening device to be filtered and pull out, repeat as required 2～3 times.
(1) by discontinuous Al
2o
3staple fibre and dispersion agent be mixed at room temperature the about 5min of stirring at low speed in whipping appts, and then standing 10min, make organic dispersing agent fully between infiltrated fiber.
(2) add quantitative hydration MgCl
2mgF
2solution, high-speed stirring 15min, make binding agent and blending in of fibers even, in the high-speed stirring process, unavoidably can produce a certain amount of foam, because foam is a large amount of places of assembling of fiber and additive, must be eliminated, and selects propyl carbinol as defoamer.
(3) end of high-speed stirring adds defoamer, proceeds to immediately the about 5min of stirring at low speed.
The compression molding of step 3. porous preform.
(1) pour the blending in of fibers slurry into the porous preforming forming die, owing to once can not pouring into fully, now open the vacuum pump be connected with the bottom of ventilating, utilization vacuumizes mode and accelerates slurries filtration speed, stir the mixed slurry in porous mold simultaneously, continually successively pour whole mixed slurries into.
(2) mixed slurry adds malleation after pouring into, during upper pressure, will evenly pressurize, and avoids because unbalance stress precast body internal stress increases layering, cracking.
(3) pump unnecessary additive and water by vacuumizing mode, then carry out the about 5min of pressurize.
For avoiding the resilience problem of precast body after discharge degree, ventilation gland by precast body mould top passes to the approximately constant temperature gas of 40 ℃ and carries out the precast body oven dry, so can make the precast body drying course evenly carry out, avoid precast body diffusion from inside to outside in resistance furnace to dry and cause binding agent to be gathered in around precast body, thus the core undercapacity.Perhaps in microwave oven, precast body is dried from outside to inside, causes the inhomogeneous intensity distribution problem of non-uniform that causes of precast body drying course.
Drying course takes out precast body after finishing in mould, and in resistance furnace, bottom surface is placed the sintering that the asbestos backing plate carries out precast body.Precast body sintering temperature increasing schedule is defined as 450 ℃ of (90min)～1100 ℃ (90min) through experiment, makes subsequently precast body furnace cooling in resistance furnace.
Embodiment of the method 2.
The discontinuous Al of step 1.
2o
3sfthe pre-treatment of staple fibre and screening.
(1) if at first want to make the precast body of volume fraction 25%, according to weighed amount Al
2o
3staple fibre, cut short mode by continuous Al by craft
2o
3fiber is cut into the discontinuous Al of length 5mm
2o
3fiber, the method can effectively be eliminated discontinuous Al
2o
3the agglomerating phenomenon of the gathering of staple fibre.
(2) adopt mechanical stirring device first in the mode of crawl, to break up in advance the fiber of reunion, when slurries dispersion to be mixed is more even, then change stirring at low speed 15min into, remove and be suspended in the impurity on slurry upper strata and the slag ball in mixed slurry, make it to form turbulent flow to facilitate Al
2o
3the subsequent disposal of fiber.Utilize the filtering screening device to be filtered and pull out, repeat as required 2～3 times.
(1) by discontinuous Al
2o
3staple fibre and dispersion agent be mixed at room temperature the about 10min of stirring at low speed in whipping appts, and then standing 15min, make organic dispersing agent fully between infiltrated fiber.
(2) add quantitative hydration MgCl
2mgF
2solution, high-speed stirring 20min, make binding agent and blending in of fibers even, in the high-speed stirring process, unavoidably can produce a certain amount of foam, because foam is a large amount of places of assembling of fiber and additive, must be eliminated, and selects propyl carbinol as defoamer.
(3) end of high-speed stirring adds defoamer, proceeds to immediately the about 10min of stirring at low speed.
The compression molding of step 3. porous preform.
(1) pour the blending in of fibers slurry into the porous preforming forming die, owing to once can not pouring into fully, now open the vacuum pump be connected with the bottom of ventilating, utilization vacuumizes mode and accelerates slurries filtration speed, stir the mixed slurry in porous mold simultaneously, continually successively pour whole mixed slurries into.
(2) mixed slurry adds malleation after pouring into, during upper pressure, will evenly pressurize, and avoids because unbalance stress precast body internal stress increases layering, cracking.
(3) pump unnecessary additive and water by vacuumizing mode, then carry out the about 20min of pressurize.
For avoiding the resilience problem of precast body after discharge degree, ventilation gland by precast body mould top passes to the approximately constant temperature gas of 70 ℃ and carries out the precast body oven dry, so can make the precast body drying course evenly carry out, avoid precast body diffusion from inside to outside in resistance furnace to dry and cause binding agent to be gathered in around precast body, thus the core undercapacity.Perhaps in microwave oven, precast body is dried from outside to inside, causes the inhomogeneous intensity distribution problem of non-uniform that causes of precast body drying course.
Drying course takes out precast body after finishing in mould, and in resistance furnace, bottom surface is placed the sintering that the asbestos backing plate carries out precast body.Precast body sintering temperature increasing schedule is defined as 450 ℃ of (100min)～1100 ℃ (120min) through experiment, makes subsequently precast body furnace cooling in resistance furnace.
Embodiment of the method 3.
The discontinuous Al of step 1.
2o
3sfthe pre-treatment of staple fibre and screening.
(1) if at first want to make the precast body of volume fraction 25%, according to weighed amount Al
2o
3staple fibre, cut short mode by continuous Al by craft
2o
3fiber is cut into the discontinuous Al of the about 10mm of length
2o
3fiber, the method can effectively be eliminated discontinuous Al
2o
3the agglomerating phenomenon of the gathering of staple fibre.
(2) adopt mechanical stirring device first in the mode of crawl, to break up in advance the fiber of reunion, when slurries dispersion to be mixed is more even, then change the about 15min of stirring at low speed into, remove and be suspended in the impurity on slurry upper strata and the slag ball in mixed slurry, make it to form turbulent flow to facilitate Al
2o
3the subsequent disposal of fiber.Utilize the filtering screening device to be filtered and pull out, repeat as required 2～3 times.
(1) by discontinuous Al
2o
3staple fibre and dispersion agent be mixed at room temperature stirring at low speed 20min in whipping appts, and then standing 15min, make organic dispersing agent fully between infiltrated fiber.
(2) add quantitative hydration MgCl
2mgF
2solution, high-speed stirring 30min, make binding agent and blending in of fibers even, in the high-speed stirring process, unavoidably can produce a certain amount of foam, because foam is a large amount of places of assembling of fiber and additive, must be eliminated, and selects propyl carbinol as defoamer.
(3) end of high-speed stirring adds defoamer, proceeds to immediately stirring at low speed 10min.
The compression molding of step 3. porous preform.
(1) pour the blending in of fibers slurry into the porous preforming forming die, owing to once can not pouring into fully, now open the vacuum pump be connected with the bottom of ventilating, utilization vacuumizes mode and accelerates slurries filtration speed, stir the mixed slurry in porous mold simultaneously, continually successively pour whole mixed slurries into.
(2) mixed slurry adds malleation after pouring into, during upper pressure, will evenly pressurize, and avoids because unbalance stress precast body internal stress increases layering, cracking.
(3) pump unnecessary additive and water by vacuumizing mode, then carry out the about 30min of pressurize.
For avoiding the resilience problem of precast body after discharge degree, ventilation gland by precast body mould top passes to the approximately constant temperature gas of 150 ℃ and carries out the precast body oven dry, so can make the precast body drying course evenly carry out, avoid precast body diffusion from inside to outside in resistance furnace to dry and cause binding agent to be gathered in around precast body, thus the core undercapacity.Perhaps in microwave oven, precast body is dried from outside to inside, causes the inhomogeneous intensity distribution problem of non-uniform that causes of precast body drying course.
Drying course takes out precast body after finishing in mould, and in resistance furnace, bottom surface is placed the sintering that the asbestos backing plate carries out precast body.Precast body sintering temperature increasing schedule is defined as 450 ℃ of (110min)～1100 ℃ (110min) through experiment, makes subsequently precast body furnace cooling in resistance furnace.
Claims (2)
1. a device for preparing aluminium sesquioxide staple fibre precast body, is characterized in that comprising horizontal depression bar (1), gland (3), perpendicular depression bar (4), container (5), bearing (6), pressure head (7) and bottom (9); Described gland (3) is provided with gland pore (2), and gland pore (2) is threaded hole, by rapid-acting coupling, realizes being connected of porous mold and breather; Described bottom (9) is bilayer structure, and upper strata is uniformly distributed some micropores, and lower floor is provided with bottom pore (10), and bottom pore (10) is threaded hole, by rapid-acting coupling, with vacuum pump, is connected; Be distributed with some pressure head micropores (8) on described pressure head (7); Described container (5) is threaded with gland (3), bottom (9), and perpendicular depression bar (4) upper end and horizontal depression bar (1) are connected, and perpendicular depression bar (4) lower end screw thread is through being connected with pressure head (7) by bearing (6) after gland (3).
2. a method of utilizing the described device for preparing aluminium sesquioxide staple fibre precast body of claim 1 to prepare aluminium sesquioxide staple fibre precast body is characterized in that comprising the following steps:
Step 1, by continuous polymorph A l
2o
3fiber is cut into the discontinuous Al that length is 1～10mm
2o
3staple fibre, adopt mechanical stirring device by discontinuous Al
2o
3staple fibre is stirring at low speed 10～15min in room temperature water, uses the filtering screening device by fiber filter and pulls out, to remove slag ball wherein;
Step 2, by discontinuous Al
2o
3staple fibre and dispersion agent utilize mechanical stirring device mix and blend 5～20min in room temperature water, remove the impurity that is suspended in the slurry upper strata, and the standing dispersion agent that makes fully infiltrates Al
2o
3between staple fibre; Add hydration MgCl
2mgF
2binding agent, high-speed stirring 15～30min, make mineral binder bond and blending in of fibers even, and the end of high-speed stirring adds the defoamer propyl carbinol, immediately stirring at low speed 5～10min;
Step 3, pour the blending in of fibers slurry into the precast body forming mould, open the vacuum pump be connected with bottom (9), by vacuumizing mode, accelerate slurries filtration speed, stir the fibre stuff in porous mold simultaneously, continually successively pour whole slurries into; Mixed slurry adds malleation after pouring into, during upper pressure, will try one's best evenly; Open vacuum pump, by vacuumizing mode, pump unnecessary additive and water, then the about 5～30min of pressurize;
Step 4, the gland (3) by porous mold top pass to the gas of 40～150 ℃ and are dried; After drying course finishes, precast body is carried out to sintering from taking out in mould; The sintering temperature system is 450 ℃, and then sintering 90～110min rises to 1100 ℃, sintering 100～120min, and stove is chilled to room temperature.
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|---|---|---|---|
| CN201310376789.6A CN103469121B (en) | 2013-08-27 | 2013-08-27 | The apparatus and method of preparation aluminium oxide short staple preform |
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| CN201310376789.6A CN103469121B (en) | 2013-08-27 | 2013-08-27 | The apparatus and method of preparation aluminium oxide short staple preform |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234370A (en) * | 2015-10-29 | 2016-01-13 | 重庆迎瑞升压铸有限公司 | Moisture removal mold core for die-casting mold |
| CN109195930A (en) * | 2016-04-25 | 2019-01-11 | 赛峰集团 | The method that fibrous texture manufactures composite material parts is injected by the way that slurry will be loaded |
| CN113802021A (en) * | 2021-09-07 | 2021-12-17 | 湖南烁科热工智能装备有限公司 | Equipment for continuously preparing high-silicon aluminum alloy in grading pressure infiltration manner |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140109A (en) * | 1995-06-27 | 1997-01-15 | 宇部兴产株式会社 | Extruder |
-
2013
- 2013-08-27 CN CN201310376789.6A patent/CN103469121B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140109A (en) * | 1995-06-27 | 1997-01-15 | 宇部兴产株式会社 | Extruder |
Non-Patent Citations (1)
| Title |
|---|
| 赵文侠等: "短纤维增强铝基复合材料预制件制备工艺的研究", 《硅酸盐通报》, vol. 29, no. 3, 30 June 2010 (2010-06-30), pages 597 - 601 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234370A (en) * | 2015-10-29 | 2016-01-13 | 重庆迎瑞升压铸有限公司 | Moisture removal mold core for die-casting mold |
| CN109195930A (en) * | 2016-04-25 | 2019-01-11 | 赛峰集团 | The method that fibrous texture manufactures composite material parts is injected by the way that slurry will be loaded |
| CN113802021A (en) * | 2021-09-07 | 2021-12-17 | 湖南烁科热工智能装备有限公司 | Equipment for continuously preparing high-silicon aluminum alloy in grading pressure infiltration manner |
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| CN103469121B (en) | 2015-10-28 |
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